./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/hardness-nfm22/hardness_fillercode_fillercodestructure_filler-pr-co_file-11.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 8fc3dc66 Calling Ultimate with: /root/.sdkman/candidates/java/21.0.5-tem/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.6.800.v20240513-1750.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/hardness-nfm22/hardness_fillercode_fillercodestructure_filler-pr-co_file-11.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 8ae218ca02b5417943c2f14caa583f12c89b5725c70ee83be125986bc0e82f29 --- Real Ultimate output --- This is Ultimate 0.3.0-?-8fc3dc6-m [2025-03-17 01:41:51,652 INFO L188 SettingsManager]: Resetting all preferences to default values... [2025-03-17 01:41:51,704 INFO L114 SettingsManager]: Loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2025-03-17 01:41:51,709 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2025-03-17 01:41:51,709 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2025-03-17 01:41:51,727 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2025-03-17 01:41:51,728 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2025-03-17 01:41:51,728 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2025-03-17 01:41:51,729 INFO L151 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2025-03-17 01:41:51,729 INFO L153 SettingsManager]: * Use memory slicer=true [2025-03-17 01:41:51,729 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2025-03-17 01:41:51,730 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2025-03-17 01:41:51,730 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2025-03-17 01:41:51,730 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2025-03-17 01:41:51,730 INFO L153 SettingsManager]: * Use SBE=true [2025-03-17 01:41:51,730 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2025-03-17 01:41:51,730 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2025-03-17 01:41:51,730 INFO L153 SettingsManager]: * sizeof long=4 [2025-03-17 01:41:51,730 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2025-03-17 01:41:51,730 INFO L153 SettingsManager]: * sizeof POINTER=4 [2025-03-17 01:41:51,730 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2025-03-17 01:41:51,730 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2025-03-17 01:41:51,730 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2025-03-17 01:41:51,731 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2025-03-17 01:41:51,731 INFO L153 SettingsManager]: * sizeof long double=12 [2025-03-17 01:41:51,731 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2025-03-17 01:41:51,731 INFO L153 SettingsManager]: * Behaviour of calls to undefined functions=OVERAPPROXIMATE_BEHAVIOUR [2025-03-17 01:41:51,731 INFO L153 SettingsManager]: * Use constant arrays=true [2025-03-17 01:41:51,731 INFO L151 SettingsManager]: Preferences of IcfgBuilder differ from their defaults: [2025-03-17 01:41:51,731 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2025-03-17 01:41:51,731 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2025-03-17 01:41:51,731 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2025-03-17 01:41:51,731 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2025-03-17 01:41:51,731 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2025-03-17 01:41:51,731 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2025-03-17 01:41:51,731 INFO L153 SettingsManager]: * Compute procedure contracts=false [2025-03-17 01:41:51,731 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2025-03-17 01:41:51,731 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2025-03-17 01:41:51,731 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2025-03-17 01:41:51,732 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2025-03-17 01:41:51,732 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2025-03-17 01:41:51,732 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2025-03-17 01:41:51,732 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2025-03-17 01:41:51,732 INFO L153 SettingsManager]: * Looper check in Petri net analysis=SEMANTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8ae218ca02b5417943c2f14caa583f12c89b5725c70ee83be125986bc0e82f29 [2025-03-17 01:41:51,970 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2025-03-17 01:41:51,982 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2025-03-17 01:41:51,984 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2025-03-17 01:41:51,985 INFO L270 PluginConnector]: Initializing CDTParser... [2025-03-17 01:41:51,985 INFO L274 PluginConnector]: CDTParser initialized [2025-03-17 01:41:51,986 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/hardness-nfm22/hardness_fillercode_fillercodestructure_filler-pr-co_file-11.i [2025-03-17 01:41:53,208 INFO L533 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7f3717ebf/142870310f4d4f1f9f9004b6728e3dda/FLAG721e790c0 [2025-03-17 01:41:53,542 INFO L384 CDTParser]: Found 1 translation units. [2025-03-17 01:41:53,543 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/hardness-nfm22/hardness_fillercode_fillercodestructure_filler-pr-co_file-11.i [2025-03-17 01:41:53,549 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7f3717ebf/142870310f4d4f1f9f9004b6728e3dda/FLAG721e790c0 [2025-03-17 01:41:53,835 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7f3717ebf/142870310f4d4f1f9f9004b6728e3dda [2025-03-17 01:41:53,841 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2025-03-17 01:41:53,844 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2025-03-17 01:41:53,848 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2025-03-17 01:41:53,848 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2025-03-17 01:41:53,852 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2025-03-17 01:41:53,853 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.03 01:41:53" (1/1) ... [2025-03-17 01:41:53,854 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@eedfe96 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 01:41:53, skipping insertion in model container [2025-03-17 01:41:53,854 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.03 01:41:53" (1/1) ... [2025-03-17 01:41:53,872 INFO L175 MainTranslator]: Built tables and reachable declarations [2025-03-17 01:41:53,973 WARN L250 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/hardness-nfm22/hardness_fillercode_fillercodestructure_filler-pr-co_file-11.i[919,932] [2025-03-17 01:41:54,025 INFO L210 PostProcessor]: Analyzing one entry point: main [2025-03-17 01:41:54,033 INFO L200 MainTranslator]: Completed pre-run [2025-03-17 01:41:54,042 WARN L250 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/hardness-nfm22/hardness_fillercode_fillercodestructure_filler-pr-co_file-11.i[919,932] [2025-03-17 01:41:54,061 INFO L210 PostProcessor]: Analyzing one entry point: main [2025-03-17 01:41:54,075 INFO L204 MainTranslator]: Completed translation [2025-03-17 01:41:54,075 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 01:41:54 WrapperNode [2025-03-17 01:41:54,075 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2025-03-17 01:41:54,076 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2025-03-17 01:41:54,076 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2025-03-17 01:41:54,076 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2025-03-17 01:41:54,081 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 01:41:54" (1/1) ... [2025-03-17 01:41:54,090 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 01:41:54" (1/1) ... [2025-03-17 01:41:54,117 INFO L138 Inliner]: procedures = 26, calls = 40, calls flagged for inlining = 8, calls inlined = 8, statements flattened = 219 [2025-03-17 01:41:54,117 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2025-03-17 01:41:54,117 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2025-03-17 01:41:54,118 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2025-03-17 01:41:54,118 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2025-03-17 01:41:54,124 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 01:41:54" (1/1) ... [2025-03-17 01:41:54,124 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 01:41:54" (1/1) ... [2025-03-17 01:41:54,126 INFO L184 PluginConnector]: Executing the observer MemorySlicer from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 01:41:54" (1/1) ... [2025-03-17 01:41:54,140 INFO L175 MemorySlicer]: Split 2 memory accesses to 1 slices as follows [2]. 100 percent of accesses are in the largest equivalence class. The 2 initializations are split as follows [2]. The 0 writes are split as follows [0]. [2025-03-17 01:41:54,141 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 01:41:54" (1/1) ... [2025-03-17 01:41:54,141 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 01:41:54" (1/1) ... [2025-03-17 01:41:54,146 INFO L184 PluginConnector]: Executing the observer ReplaceArrayAssignments from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 01:41:54" (1/1) ... [2025-03-17 01:41:54,147 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 01:41:54" (1/1) ... [2025-03-17 01:41:54,148 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 01:41:54" (1/1) ... [2025-03-17 01:41:54,149 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 01:41:54" (1/1) ... [2025-03-17 01:41:54,150 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2025-03-17 01:41:54,151 INFO L112 PluginConnector]: ------------------------IcfgBuilder---------------------------- [2025-03-17 01:41:54,151 INFO L270 PluginConnector]: Initializing IcfgBuilder... [2025-03-17 01:41:54,151 INFO L274 PluginConnector]: IcfgBuilder initialized [2025-03-17 01:41:54,153 INFO L184 PluginConnector]: Executing the observer IcfgBuilderObserver from plugin IcfgBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 01:41:54" (1/1) ... [2025-03-17 01:41:54,156 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2025-03-17 01:41:54,167 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 01:41:54,183 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (exit command is (exit), workingDir is null) [2025-03-17 01:41:54,186 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (1)] Waiting until timeout for monitored process [2025-03-17 01:41:54,204 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2025-03-17 01:41:54,204 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2025-03-17 01:41:54,205 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2025-03-17 01:41:54,205 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#0 [2025-03-17 01:41:54,205 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2025-03-17 01:41:54,205 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2025-03-17 01:41:54,275 INFO L256 CfgBuilder]: Building ICFG [2025-03-17 01:41:54,276 INFO L286 CfgBuilder]: Building CFG for each procedure with an implementation [2025-03-17 01:41:54,649 INFO L? ?]: Removed 15 outVars from TransFormulas that were not future-live. [2025-03-17 01:41:54,649 INFO L307 CfgBuilder]: Performing block encoding [2025-03-17 01:41:54,665 INFO L331 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2025-03-17 01:41:54,667 INFO L336 CfgBuilder]: Removed 2 assume(true) statements. [2025-03-17 01:41:54,667 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.icfgbuilder CFG 17.03 01:41:54 BoogieIcfgContainer [2025-03-17 01:41:54,667 INFO L131 PluginConnector]: ------------------------ END IcfgBuilder---------------------------- [2025-03-17 01:41:54,669 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2025-03-17 01:41:54,669 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2025-03-17 01:41:54,673 INFO L274 PluginConnector]: TraceAbstraction initialized [2025-03-17 01:41:54,673 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 17.03 01:41:53" (1/3) ... [2025-03-17 01:41:54,674 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f2b7084 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.03 01:41:54, skipping insertion in model container [2025-03-17 01:41:54,674 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 01:41:54" (2/3) ... [2025-03-17 01:41:54,675 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f2b7084 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.03 01:41:54, skipping insertion in model container [2025-03-17 01:41:54,675 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.icfgbuilder CFG 17.03 01:41:54" (3/3) ... [2025-03-17 01:41:54,676 INFO L128 eAbstractionObserver]: Analyzing ICFG hardness_fillercode_fillercodestructure_filler-pr-co_file-11.i [2025-03-17 01:41:54,688 INFO L216 ceAbstractionStarter]: Automizer settings: Hoare:LoopHeads NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2025-03-17 01:41:54,689 INFO L151 ceAbstractionStarter]: Applying trace abstraction to ICFG hardness_fillercode_fillercodestructure_filler-pr-co_file-11.i that has 2 procedures, 87 locations, 1 initial locations, 1 loop locations, and 1 error locations. [2025-03-17 01:41:54,742 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2025-03-17 01:41:54,750 INFO L333 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@227e172d, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2025-03-17 01:41:54,752 INFO L334 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2025-03-17 01:41:54,757 INFO L276 IsEmpty]: Start isEmpty. Operand has 87 states, 57 states have (on average 1.5263157894736843) internal successors, (87), 58 states have internal predecessors, (87), 27 states have call successors, (27), 1 states have call predecessors, (27), 1 states have return successors, (27), 27 states have call predecessors, (27), 27 states have call successors, (27) [2025-03-17 01:41:54,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2025-03-17 01:41:54,766 INFO L210 NwaCegarLoop]: Found error trace [2025-03-17 01:41:54,767 INFO L218 NwaCegarLoop]: trace histogram [27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 01:41:54,767 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2025-03-17 01:41:54,770 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 01:41:54,771 INFO L85 PathProgramCache]: Analyzing trace with hash -1529333741, now seen corresponding path program 1 times [2025-03-17 01:41:54,776 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 01:41:54,776 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [282624776] [2025-03-17 01:41:54,776 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 01:41:54,777 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 01:41:54,862 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 169 statements into 1 equivalence classes. [2025-03-17 01:41:54,885 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 169 of 169 statements. [2025-03-17 01:41:54,885 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 01:41:54,886 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 01:41:55,090 INFO L134 CoverageAnalysis]: Checked inductivity of 1404 backedges. 0 proven. 52 refuted. 0 times theorem prover too weak. 1352 trivial. 0 not checked. [2025-03-17 01:41:55,093 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 01:41:55,093 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [282624776] [2025-03-17 01:41:55,094 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [282624776] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 01:41:55,094 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [237095141] [2025-03-17 01:41:55,094 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 01:41:55,094 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 01:41:55,095 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 01:41:55,097 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-03-17 01:41:55,098 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2025-03-17 01:41:55,190 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 169 statements into 1 equivalence classes. [2025-03-17 01:41:55,271 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 169 of 169 statements. [2025-03-17 01:41:55,271 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 01:41:55,272 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 01:41:55,274 INFO L256 TraceCheckSpWp]: Trace formula consists of 417 conjuncts, 1 conjuncts are in the unsatisfiable core [2025-03-17 01:41:55,283 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 01:41:55,311 INFO L134 CoverageAnalysis]: Checked inductivity of 1404 backedges. 52 proven. 0 refuted. 0 times theorem prover too weak. 1352 trivial. 0 not checked. [2025-03-17 01:41:55,312 INFO L308 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2025-03-17 01:41:55,312 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [237095141] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 01:41:55,312 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2025-03-17 01:41:55,312 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [2] total 2 [2025-03-17 01:41:55,314 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2006366448] [2025-03-17 01:41:55,314 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 01:41:55,317 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2025-03-17 01:41:55,317 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 01:41:55,332 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2025-03-17 01:41:55,332 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2025-03-17 01:41:55,334 INFO L87 Difference]: Start difference. First operand has 87 states, 57 states have (on average 1.5263157894736843) internal successors, (87), 58 states have internal predecessors, (87), 27 states have call successors, (27), 1 states have call predecessors, (27), 1 states have return successors, (27), 27 states have call predecessors, (27), 27 states have call successors, (27) Second operand has 2 states, 2 states have (on average 19.5) internal successors, (39), 2 states have internal predecessors, (39), 2 states have call successors, (27), 2 states have call predecessors, (27), 1 states have return successors, (27), 1 states have call predecessors, (27), 2 states have call successors, (27) [2025-03-17 01:41:55,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2025-03-17 01:41:55,370 INFO L93 Difference]: Finished difference Result 171 states and 307 transitions. [2025-03-17 01:41:55,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2025-03-17 01:41:55,374 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 19.5) internal successors, (39), 2 states have internal predecessors, (39), 2 states have call successors, (27), 2 states have call predecessors, (27), 1 states have return successors, (27), 1 states have call predecessors, (27), 2 states have call successors, (27) Word has length 169 [2025-03-17 01:41:55,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2025-03-17 01:41:55,380 INFO L225 Difference]: With dead ends: 171 [2025-03-17 01:41:55,381 INFO L226 Difference]: Without dead ends: 85 [2025-03-17 01:41:55,385 INFO L434 NwaCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 170 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2025-03-17 01:41:55,387 INFO L435 NwaCegarLoop]: 133 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 3 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2025-03-17 01:41:55,388 INFO L436 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 133 Invalid, 3 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2025-03-17 01:41:55,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2025-03-17 01:41:55,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2025-03-17 01:41:55,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 56 states have (on average 1.4642857142857142) internal successors, (82), 56 states have internal predecessors, (82), 27 states have call successors, (27), 1 states have call predecessors, (27), 1 states have return successors, (27), 27 states have call predecessors, (27), 27 states have call successors, (27) [2025-03-17 01:41:55,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 136 transitions. [2025-03-17 01:41:55,417 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 136 transitions. Word has length 169 [2025-03-17 01:41:55,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2025-03-17 01:41:55,418 INFO L471 AbstractCegarLoop]: Abstraction has 85 states and 136 transitions. [2025-03-17 01:41:55,418 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 19.5) internal successors, (39), 2 states have internal predecessors, (39), 2 states have call successors, (27), 2 states have call predecessors, (27), 1 states have return successors, (27), 1 states have call predecessors, (27), 2 states have call successors, (27) [2025-03-17 01:41:55,418 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 136 transitions. [2025-03-17 01:41:55,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2025-03-17 01:41:55,422 INFO L210 NwaCegarLoop]: Found error trace [2025-03-17 01:41:55,422 INFO L218 NwaCegarLoop]: trace histogram [27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 01:41:55,428 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2025-03-17 01:41:55,623 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2025-03-17 01:41:55,624 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2025-03-17 01:41:55,625 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 01:41:55,625 INFO L85 PathProgramCache]: Analyzing trace with hash -475601066, now seen corresponding path program 1 times [2025-03-17 01:41:55,625 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 01:41:55,625 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1731820584] [2025-03-17 01:41:55,626 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 01:41:55,627 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 01:41:55,658 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 169 statements into 1 equivalence classes. [2025-03-17 01:41:55,739 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 169 of 169 statements. [2025-03-17 01:41:55,742 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 01:41:55,742 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 01:41:56,552 INFO L134 CoverageAnalysis]: Checked inductivity of 1404 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2025-03-17 01:41:56,552 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 01:41:56,552 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1731820584] [2025-03-17 01:41:56,553 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1731820584] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 01:41:56,553 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 01:41:56,553 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2025-03-17 01:41:56,553 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [508731530] [2025-03-17 01:41:56,553 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 01:41:56,553 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2025-03-17 01:41:56,554 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 01:41:56,554 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2025-03-17 01:41:56,554 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2025-03-17 01:41:56,557 INFO L87 Difference]: Start difference. First operand 85 states and 136 transitions. Second operand has 5 states, 5 states have (on average 7.4) internal successors, (37), 5 states have internal predecessors, (37), 1 states have call successors, (27), 1 states have call predecessors, (27), 1 states have return successors, (27), 1 states have call predecessors, (27), 1 states have call successors, (27) [2025-03-17 01:41:56,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2025-03-17 01:41:56,669 INFO L93 Difference]: Finished difference Result 195 states and 312 transitions. [2025-03-17 01:41:56,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2025-03-17 01:41:56,674 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 7.4) internal successors, (37), 5 states have internal predecessors, (37), 1 states have call successors, (27), 1 states have call predecessors, (27), 1 states have return successors, (27), 1 states have call predecessors, (27), 1 states have call successors, (27) Word has length 169 [2025-03-17 01:41:56,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2025-03-17 01:41:56,677 INFO L225 Difference]: With dead ends: 195 [2025-03-17 01:41:56,677 INFO L226 Difference]: Without dead ends: 111 [2025-03-17 01:41:56,678 INFO L434 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2025-03-17 01:41:56,680 INFO L435 NwaCegarLoop]: 125 mSDtfsCounter, 115 mSDsluCounter, 231 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 115 SdHoareTripleChecker+Valid, 356 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2025-03-17 01:41:56,680 INFO L436 NwaCegarLoop]: SdHoareTripleChecker [115 Valid, 356 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2025-03-17 01:41:56,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2025-03-17 01:41:56,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 99. [2025-03-17 01:41:56,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 70 states have (on average 1.4857142857142858) internal successors, (104), 70 states have internal predecessors, (104), 27 states have call successors, (27), 1 states have call predecessors, (27), 1 states have return successors, (27), 27 states have call predecessors, (27), 27 states have call successors, (27) [2025-03-17 01:41:56,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 158 transitions. [2025-03-17 01:41:56,700 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 158 transitions. Word has length 169 [2025-03-17 01:41:56,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2025-03-17 01:41:56,701 INFO L471 AbstractCegarLoop]: Abstraction has 99 states and 158 transitions. [2025-03-17 01:41:56,701 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 7.4) internal successors, (37), 5 states have internal predecessors, (37), 1 states have call successors, (27), 1 states have call predecessors, (27), 1 states have return successors, (27), 1 states have call predecessors, (27), 1 states have call successors, (27) [2025-03-17 01:41:56,702 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 158 transitions. [2025-03-17 01:41:56,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2025-03-17 01:41:56,706 INFO L210 NwaCegarLoop]: Found error trace [2025-03-17 01:41:56,706 INFO L218 NwaCegarLoop]: trace histogram [27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 01:41:56,707 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2025-03-17 01:41:56,707 INFO L396 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2025-03-17 01:41:56,707 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 01:41:56,708 INFO L85 PathProgramCache]: Analyzing trace with hash 1267209269, now seen corresponding path program 1 times [2025-03-17 01:41:56,708 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 01:41:56,708 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1710013911] [2025-03-17 01:41:56,708 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 01:41:56,709 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 01:41:56,733 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 169 statements into 1 equivalence classes. [2025-03-17 01:41:56,801 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 169 of 169 statements. [2025-03-17 01:41:56,806 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 01:41:56,806 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 01:41:57,061 INFO L134 CoverageAnalysis]: Checked inductivity of 1404 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2025-03-17 01:41:57,063 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 01:41:57,063 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1710013911] [2025-03-17 01:41:57,063 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1710013911] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 01:41:57,063 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 01:41:57,063 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2025-03-17 01:41:57,063 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [701640481] [2025-03-17 01:41:57,063 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 01:41:57,064 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2025-03-17 01:41:57,064 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 01:41:57,065 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2025-03-17 01:41:57,066 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2025-03-17 01:41:57,067 INFO L87 Difference]: Start difference. First operand 99 states and 158 transitions. Second operand has 5 states, 5 states have (on average 7.4) internal successors, (37), 5 states have internal predecessors, (37), 1 states have call successors, (27), 1 states have call predecessors, (27), 1 states have return successors, (27), 1 states have call predecessors, (27), 1 states have call successors, (27) [2025-03-17 01:41:57,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2025-03-17 01:41:57,333 INFO L93 Difference]: Finished difference Result 296 states and 473 transitions. [2025-03-17 01:41:57,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2025-03-17 01:41:57,333 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 7.4) internal successors, (37), 5 states have internal predecessors, (37), 1 states have call successors, (27), 1 states have call predecessors, (27), 1 states have return successors, (27), 1 states have call predecessors, (27), 1 states have call successors, (27) Word has length 169 [2025-03-17 01:41:57,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2025-03-17 01:41:57,335 INFO L225 Difference]: With dead ends: 296 [2025-03-17 01:41:57,335 INFO L226 Difference]: Without dead ends: 198 [2025-03-17 01:41:57,336 INFO L434 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2025-03-17 01:41:57,337 INFO L435 NwaCegarLoop]: 129 mSDtfsCounter, 98 mSDsluCounter, 318 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 82 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 447 SdHoareTripleChecker+Invalid, 177 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 82 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2025-03-17 01:41:57,337 INFO L436 NwaCegarLoop]: SdHoareTripleChecker [98 Valid, 447 Invalid, 177 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [82 Valid, 95 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2025-03-17 01:41:57,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2025-03-17 01:41:57,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 147. [2025-03-17 01:41:57,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 90 states have (on average 1.3777777777777778) internal successors, (124), 90 states have internal predecessors, (124), 54 states have call successors, (54), 2 states have call predecessors, (54), 2 states have return successors, (54), 54 states have call predecessors, (54), 54 states have call successors, (54) [2025-03-17 01:41:57,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 232 transitions. [2025-03-17 01:41:57,366 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 232 transitions. Word has length 169 [2025-03-17 01:41:57,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2025-03-17 01:41:57,366 INFO L471 AbstractCegarLoop]: Abstraction has 147 states and 232 transitions. [2025-03-17 01:41:57,367 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 7.4) internal successors, (37), 5 states have internal predecessors, (37), 1 states have call successors, (27), 1 states have call predecessors, (27), 1 states have return successors, (27), 1 states have call predecessors, (27), 1 states have call successors, (27) [2025-03-17 01:41:57,367 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 232 transitions. [2025-03-17 01:41:57,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2025-03-17 01:41:57,372 INFO L210 NwaCegarLoop]: Found error trace [2025-03-17 01:41:57,373 INFO L218 NwaCegarLoop]: trace histogram [27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 01:41:57,373 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2025-03-17 01:41:57,373 INFO L396 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2025-03-17 01:41:57,373 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 01:41:57,374 INFO L85 PathProgramCache]: Analyzing trace with hash 2067987557, now seen corresponding path program 1 times [2025-03-17 01:41:57,374 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 01:41:57,374 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [809148113] [2025-03-17 01:41:57,374 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 01:41:57,374 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 01:41:57,412 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 170 statements into 1 equivalence classes. [2025-03-17 01:41:57,531 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 170 of 170 statements. [2025-03-17 01:41:57,531 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 01:41:57,531 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 01:41:58,037 INFO L134 CoverageAnalysis]: Checked inductivity of 1404 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2025-03-17 01:41:58,038 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 01:41:58,038 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [809148113] [2025-03-17 01:41:58,038 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [809148113] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 01:41:58,038 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 01:41:58,038 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2025-03-17 01:41:58,038 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1065778708] [2025-03-17 01:41:58,038 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 01:41:58,039 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2025-03-17 01:41:58,039 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 01:41:58,039 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2025-03-17 01:41:58,039 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2025-03-17 01:41:58,040 INFO L87 Difference]: Start difference. First operand 147 states and 232 transitions. Second operand has 5 states, 5 states have (on average 7.6) internal successors, (38), 5 states have internal predecessors, (38), 1 states have call successors, (27), 1 states have call predecessors, (27), 1 states have return successors, (27), 1 states have call predecessors, (27), 1 states have call successors, (27) [2025-03-17 01:41:58,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2025-03-17 01:41:58,378 INFO L93 Difference]: Finished difference Result 409 states and 650 transitions. [2025-03-17 01:41:58,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2025-03-17 01:41:58,378 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 7.6) internal successors, (38), 5 states have internal predecessors, (38), 1 states have call successors, (27), 1 states have call predecessors, (27), 1 states have return successors, (27), 1 states have call predecessors, (27), 1 states have call successors, (27) Word has length 170 [2025-03-17 01:41:58,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2025-03-17 01:41:58,384 INFO L225 Difference]: With dead ends: 409 [2025-03-17 01:41:58,384 INFO L226 Difference]: Without dead ends: 311 [2025-03-17 01:41:58,385 INFO L434 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2025-03-17 01:41:58,386 INFO L435 NwaCegarLoop]: 132 mSDtfsCounter, 196 mSDsluCounter, 180 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 139 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 196 SdHoareTripleChecker+Valid, 312 SdHoareTripleChecker+Invalid, 242 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 139 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2025-03-17 01:41:58,387 INFO L436 NwaCegarLoop]: SdHoareTripleChecker [196 Valid, 312 Invalid, 242 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [139 Valid, 103 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2025-03-17 01:41:58,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 311 states. [2025-03-17 01:41:58,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 311 to 250. [2025-03-17 01:41:58,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 250 states, 165 states have (on average 1.4424242424242424) internal successors, (238), 165 states have internal predecessors, (238), 81 states have call successors, (81), 3 states have call predecessors, (81), 3 states have return successors, (81), 81 states have call predecessors, (81), 81 states have call successors, (81) [2025-03-17 01:41:58,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 250 states to 250 states and 400 transitions. [2025-03-17 01:41:58,435 INFO L78 Accepts]: Start accepts. Automaton has 250 states and 400 transitions. Word has length 170 [2025-03-17 01:41:58,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2025-03-17 01:41:58,436 INFO L471 AbstractCegarLoop]: Abstraction has 250 states and 400 transitions. [2025-03-17 01:41:58,436 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 7.6) internal successors, (38), 5 states have internal predecessors, (38), 1 states have call successors, (27), 1 states have call predecessors, (27), 1 states have return successors, (27), 1 states have call predecessors, (27), 1 states have call successors, (27) [2025-03-17 01:41:58,436 INFO L276 IsEmpty]: Start isEmpty. Operand 250 states and 400 transitions. [2025-03-17 01:41:58,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2025-03-17 01:41:58,437 INFO L210 NwaCegarLoop]: Found error trace [2025-03-17 01:41:58,437 INFO L218 NwaCegarLoop]: trace histogram [27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 01:41:58,438 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2025-03-17 01:41:58,438 INFO L396 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2025-03-17 01:41:58,438 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 01:41:58,438 INFO L85 PathProgramCache]: Analyzing trace with hash 713934083, now seen corresponding path program 1 times [2025-03-17 01:41:58,438 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 01:41:58,438 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [905394184] [2025-03-17 01:41:58,439 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 01:41:58,439 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 01:41:58,451 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 171 statements into 1 equivalence classes. [2025-03-17 01:41:58,513 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 171 of 171 statements. [2025-03-17 01:41:58,514 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 01:41:58,514 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 01:41:58,851 INFO L134 CoverageAnalysis]: Checked inductivity of 1404 backedges. 9 proven. 69 refuted. 0 times theorem prover too weak. 1326 trivial. 0 not checked. [2025-03-17 01:41:58,852 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 01:41:58,852 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [905394184] [2025-03-17 01:41:58,852 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [905394184] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 01:41:58,852 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [234827322] [2025-03-17 01:41:58,853 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 01:41:58,853 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 01:41:58,853 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 01:41:58,855 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-03-17 01:41:58,857 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2025-03-17 01:41:58,910 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 171 statements into 1 equivalence classes. [2025-03-17 01:41:58,956 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 171 of 171 statements. [2025-03-17 01:41:58,956 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 01:41:58,956 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 01:41:58,961 INFO L256 TraceCheckSpWp]: Trace formula consists of 411 conjuncts, 11 conjuncts are in the unsatisfiable core [2025-03-17 01:41:58,968 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 01:41:59,608 INFO L134 CoverageAnalysis]: Checked inductivity of 1404 backedges. 308 proven. 69 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2025-03-17 01:41:59,608 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 01:41:59,978 INFO L134 CoverageAnalysis]: Checked inductivity of 1404 backedges. 9 proven. 69 refuted. 0 times theorem prover too weak. 1326 trivial. 0 not checked. [2025-03-17 01:41:59,978 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [234827322] provided 0 perfect and 2 imperfect interpolant sequences [2025-03-17 01:41:59,978 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2025-03-17 01:41:59,978 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 14 [2025-03-17 01:41:59,978 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [482392737] [2025-03-17 01:41:59,978 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2025-03-17 01:41:59,979 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2025-03-17 01:41:59,979 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 01:41:59,980 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2025-03-17 01:41:59,980 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=129, Unknown=0, NotChecked=0, Total=182 [2025-03-17 01:41:59,980 INFO L87 Difference]: Start difference. First operand 250 states and 400 transitions. Second operand has 14 states, 14 states have (on average 7.071428571428571) internal successors, (99), 14 states have internal predecessors, (99), 5 states have call successors, (77), 3 states have call predecessors, (77), 6 states have return successors, (78), 5 states have call predecessors, (78), 5 states have call successors, (78) [2025-03-17 01:42:00,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2025-03-17 01:42:00,217 INFO L93 Difference]: Finished difference Result 444 states and 697 transitions. [2025-03-17 01:42:00,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2025-03-17 01:42:00,220 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 7.071428571428571) internal successors, (99), 14 states have internal predecessors, (99), 5 states have call successors, (77), 3 states have call predecessors, (77), 6 states have return successors, (78), 5 states have call predecessors, (78), 5 states have call successors, (78) Word has length 171 [2025-03-17 01:42:00,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2025-03-17 01:42:00,222 INFO L225 Difference]: With dead ends: 444 [2025-03-17 01:42:00,222 INFO L226 Difference]: Without dead ends: 243 [2025-03-17 01:42:00,223 INFO L434 NwaCegarLoop]: 0 DeclaredPredicates, 351 GetRequests, 334 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=104, Invalid=202, Unknown=0, NotChecked=0, Total=306 [2025-03-17 01:42:00,225 INFO L435 NwaCegarLoop]: 93 mSDtfsCounter, 166 mSDsluCounter, 198 mSDsCounter, 0 mSdLazyCounter, 245 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 168 SdHoareTripleChecker+Valid, 291 SdHoareTripleChecker+Invalid, 263 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 245 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2025-03-17 01:42:00,225 INFO L436 NwaCegarLoop]: SdHoareTripleChecker [168 Valid, 291 Invalid, 263 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 245 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2025-03-17 01:42:00,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2025-03-17 01:42:00,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 231. [2025-03-17 01:42:00,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 231 states, 143 states have (on average 1.3216783216783217) internal successors, (189), 143 states have internal predecessors, (189), 81 states have call successors, (81), 6 states have call predecessors, (81), 6 states have return successors, (81), 81 states have call predecessors, (81), 81 states have call successors, (81) [2025-03-17 01:42:00,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 231 states to 231 states and 351 transitions. [2025-03-17 01:42:00,262 INFO L78 Accepts]: Start accepts. Automaton has 231 states and 351 transitions. Word has length 171 [2025-03-17 01:42:00,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2025-03-17 01:42:00,262 INFO L471 AbstractCegarLoop]: Abstraction has 231 states and 351 transitions. [2025-03-17 01:42:00,262 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 7.071428571428571) internal successors, (99), 14 states have internal predecessors, (99), 5 states have call successors, (77), 3 states have call predecessors, (77), 6 states have return successors, (78), 5 states have call predecessors, (78), 5 states have call successors, (78) [2025-03-17 01:42:00,263 INFO L276 IsEmpty]: Start isEmpty. Operand 231 states and 351 transitions. [2025-03-17 01:42:00,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2025-03-17 01:42:00,264 INFO L210 NwaCegarLoop]: Found error trace [2025-03-17 01:42:00,264 INFO L218 NwaCegarLoop]: trace histogram [27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 01:42:00,271 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2025-03-17 01:42:00,464 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 01:42:00,467 INFO L396 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2025-03-17 01:42:00,467 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 01:42:00,467 INFO L85 PathProgramCache]: Analyzing trace with hash -1506110824, now seen corresponding path program 1 times [2025-03-17 01:42:00,467 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 01:42:00,467 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1032878281] [2025-03-17 01:42:00,467 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 01:42:00,467 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 01:42:00,487 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 171 statements into 1 equivalence classes. [2025-03-17 01:42:00,629 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 171 of 171 statements. [2025-03-17 01:42:00,630 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 01:42:00,630 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 01:42:05,460 INFO L134 CoverageAnalysis]: Checked inductivity of 1404 backedges. 45 proven. 105 refuted. 0 times theorem prover too weak. 1254 trivial. 0 not checked. [2025-03-17 01:42:05,461 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 01:42:05,461 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1032878281] [2025-03-17 01:42:05,461 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1032878281] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 01:42:05,461 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [844545630] [2025-03-17 01:42:05,461 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 01:42:05,461 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 01:42:05,462 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 01:42:05,463 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-03-17 01:42:05,466 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2025-03-17 01:42:05,514 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 171 statements into 1 equivalence classes. [2025-03-17 01:42:05,598 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 171 of 171 statements. [2025-03-17 01:42:05,598 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 01:42:05,598 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 01:42:05,604 INFO L256 TraceCheckSpWp]: Trace formula consists of 415 conjuncts, 65 conjuncts are in the unsatisfiable core [2025-03-17 01:42:05,612 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 01:42:10,887 INFO L134 CoverageAnalysis]: Checked inductivity of 1404 backedges. 540 proven. 348 refuted. 0 times theorem prover too weak. 516 trivial. 0 not checked. [2025-03-17 01:42:10,887 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 01:42:41,719 WARN L286 SmtUtils]: Spent 6.15s on a formula simplification. DAG size of input: 156 DAG size of output: 155 (called from [L 388] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2025-03-17 01:42:41,722 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [844545630] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 01:42:41,723 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2025-03-17 01:42:41,723 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 28] total 42 [2025-03-17 01:42:41,723 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [243648055] [2025-03-17 01:42:41,723 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2025-03-17 01:42:41,723 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2025-03-17 01:42:41,723 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 01:42:41,724 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2025-03-17 01:42:41,726 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=541, Invalid=2881, Unknown=0, NotChecked=0, Total=3422 [2025-03-17 01:42:41,726 INFO L87 Difference]: Start difference. First operand 231 states and 351 transitions. Second operand has 42 states, 40 states have (on average 2.45) internal successors, (98), 39 states have internal predecessors, (98), 13 states have call successors, (54), 8 states have call predecessors, (54), 10 states have return successors, (54), 13 states have call predecessors, (54), 13 states have call successors, (54) [2025-03-17 01:43:13,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2025-03-17 01:43:13,160 INFO L93 Difference]: Finished difference Result 1392 states and 1956 transitions. [2025-03-17 01:43:13,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 127 states. [2025-03-17 01:43:13,160 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 40 states have (on average 2.45) internal successors, (98), 39 states have internal predecessors, (98), 13 states have call successors, (54), 8 states have call predecessors, (54), 10 states have return successors, (54), 13 states have call predecessors, (54), 13 states have call successors, (54) Word has length 171 [2025-03-17 01:43:13,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2025-03-17 01:43:13,169 INFO L225 Difference]: With dead ends: 1392 [2025-03-17 01:43:13,169 INFO L226 Difference]: Without dead ends: 1214 [2025-03-17 01:43:13,175 INFO L434 NwaCegarLoop]: 0 DeclaredPredicates, 452 GetRequests, 271 SyntacticMatches, 1 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11063 ImplicationChecksByTransitivity, 44.4s TimeCoverageRelationStatistics Valid=5158, Invalid=27784, Unknown=0, NotChecked=0, Total=32942 [2025-03-17 01:43:13,176 INFO L435 NwaCegarLoop]: 171 mSDtfsCounter, 2006 mSDsluCounter, 1771 mSDsCounter, 0 mSdLazyCounter, 3278 mSolverCounterSat, 477 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2010 SdHoareTripleChecker+Valid, 1942 SdHoareTripleChecker+Invalid, 3755 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 477 IncrementalHoareTripleChecker+Valid, 3278 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.1s IncrementalHoareTripleChecker+Time [2025-03-17 01:43:13,176 INFO L436 NwaCegarLoop]: SdHoareTripleChecker [2010 Valid, 1942 Invalid, 3755 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [477 Valid, 3278 Invalid, 0 Unknown, 0 Unchecked, 5.1s Time] [2025-03-17 01:43:13,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1214 states. [2025-03-17 01:43:13,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1214 to 325. [2025-03-17 01:43:13,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 325 states, 223 states have (on average 1.295964125560538) internal successors, (289), 223 states have internal predecessors, (289), 81 states have call successors, (81), 20 states have call predecessors, (81), 20 states have return successors, (81), 81 states have call predecessors, (81), 81 states have call successors, (81) [2025-03-17 01:43:13,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 325 states to 325 states and 451 transitions. [2025-03-17 01:43:13,252 INFO L78 Accepts]: Start accepts. Automaton has 325 states and 451 transitions. Word has length 171 [2025-03-17 01:43:13,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2025-03-17 01:43:13,252 INFO L471 AbstractCegarLoop]: Abstraction has 325 states and 451 transitions. [2025-03-17 01:43:13,253 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 40 states have (on average 2.45) internal successors, (98), 39 states have internal predecessors, (98), 13 states have call successors, (54), 8 states have call predecessors, (54), 10 states have return successors, (54), 13 states have call predecessors, (54), 13 states have call successors, (54) [2025-03-17 01:43:13,253 INFO L276 IsEmpty]: Start isEmpty. Operand 325 states and 451 transitions. [2025-03-17 01:43:13,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2025-03-17 01:43:13,254 INFO L210 NwaCegarLoop]: Found error trace [2025-03-17 01:43:13,254 INFO L218 NwaCegarLoop]: trace histogram [27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 01:43:13,262 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2025-03-17 01:43:13,459 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 01:43:13,459 INFO L396 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2025-03-17 01:43:13,459 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 01:43:13,460 INFO L85 PathProgramCache]: Analyzing trace with hash 1595336456, now seen corresponding path program 1 times [2025-03-17 01:43:13,460 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 01:43:13,460 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [237043945] [2025-03-17 01:43:13,460 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 01:43:13,460 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 01:43:13,469 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 172 statements into 1 equivalence classes. [2025-03-17 01:43:13,574 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 172 of 172 statements. [2025-03-17 01:43:13,574 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 01:43:13,574 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 01:43:15,786 INFO L134 CoverageAnalysis]: Checked inductivity of 1404 backedges. 54 proven. 96 refuted. 0 times theorem prover too weak. 1254 trivial. 0 not checked. [2025-03-17 01:43:15,786 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 01:43:15,786 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [237043945] [2025-03-17 01:43:15,786 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [237043945] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 01:43:15,787 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [446205419] [2025-03-17 01:43:15,787 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 01:43:15,787 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 01:43:15,787 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 01:43:15,788 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-03-17 01:43:15,789 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2025-03-17 01:43:15,834 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 172 statements into 1 equivalence classes. [2025-03-17 01:43:15,895 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 172 of 172 statements. [2025-03-17 01:43:15,895 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 01:43:15,895 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 01:43:15,897 INFO L256 TraceCheckSpWp]: Trace formula consists of 417 conjuncts, 45 conjuncts are in the unsatisfiable core [2025-03-17 01:43:15,900 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 01:43:18,680 INFO L134 CoverageAnalysis]: Checked inductivity of 1404 backedges. 601 proven. 294 refuted. 0 times theorem prover too weak. 509 trivial. 0 not checked. [2025-03-17 01:43:18,680 INFO L312 TraceCheckSpWp]: Computing backward predicates...